Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2656312406a51bd…

MALICIOUS

PDF

73.0 KB Created: 2021-02-28 14:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 239766f635166385407cd98a6a10bcae SHA-1: 0b726c46a8f545e408099d2129cdb6e811e87871 SHA-256: e2656312406a51bd6e013765db7d2b7f43d3ac45af8ea089d9f4b0ae41d5a839
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which appear to be SEO-optimized for various topics, suggesting a link farm designed to drive traffic or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous disposable domains and a link farm heuristic indicates a high likelihood of malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a malicious workflow, likely involving redirection to exploit kits or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=free+maps+for+garmin+gpsmap+62s PDF link annotation
    • http://wildboost.club/asla_pes_etme_1_turkce_dublaj_indir6cd4w.pdfIn PDF document text
    • http://senteber.site/sato_cl4nx_problemsyn2wy.pdfIn PDF document text
    • http://macsk.space/52505054721033e9.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/8059384.pdfIn PDF document text
    • http://8gusevshop.space/poweraudio_pro_music_player_reviewi2ktk.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/samsung_blu_ray_bd-j5700_apps.pdfIn PDF document text
    • https://wutikivefuripiz.weebly.com/uploads/1/3/4/6/134662644/dogubenavufiviz.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/397390.pdfIn PDF document text
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/73e41964cc.pdfIn PDF document text
    • https://bigimegena.weebly.com/uploads/1/3/1/4/131438437/juwapoz.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/kagiwoxegurexiba.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/639dea.pdfIn PDF document text
    • http://baby-slings.ru/best_answer_tradutorvl0bg.pdfIn PDF document text
    • http://presentinsta.site/vuzukutaxupovagedozoveps5if5.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/tatuxumem_temef_ragujanukuwit_sezevikop.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/gevaxagat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 5428 bytes
SHA-256: 4da9a395d7d9a7e152f2dbc7c427300e7e743ce049ae36e37fbace718703fe96
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 10576 bytes
SHA-256: f88b756539a3074a34f2d3154dc115dca515e50057e79265eb21da5f287db336

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